export function maskEmail(email: string): string {
  if (!email) return '';
  const atIndex = email.indexOf('@');
  if (atIndex <= 1) {
    return email;
  }
  const firstPart = email.substring(0, atIndex - 1);
  const lastPart = email.substring(atIndex);
  const maskedPart = '*'.repeat(firstPart.length - 1);
  return `${firstPart.charAt(0)}${maskedPart}${email.charAt(atIndex - 1)}${lastPart}`;
}
